Metric M4 Switch Tip knob cap for Toggle Pickup Selector ,Metal /Chrome

I'd recommend trying the 3.5 if your particular about fitment (haven't tried it). Looks and feels great. However, it did not fit my Epiphone Les Paul Standard. Had to use several wraps of teflon tape (tape used in plumbing to ensire no leaks). Works like a charm, but just wanted to put that out there if there's anyone looking at this with an Epiphone.